The Rolex replica watches Deepsea's case is equipped with a drain valve that protects the diver's watch from damage during deep dive. Rolex replica watches uk patented the drain valve in 1967. When the diver is decompressing in the high pressure chamber, the drain valve releases the excessive pressure accumulated inside the case. The safety and reliability of the replica watches sale is definitely the top priority in deep diving activities. Therefore, every Rolex Deepsea has to pass the Rolex strict waterproof test. To this end, Rolex teamed up with Comex to develop a high-pressure test box. Each replica rolex Deepsea is water resistant to 3,900 meters.